Notes:
1. Source: Illumination Engineering Society of North America, "Lighting Handbook", 8th Edition, 1993.
2. Footcandle is the amount of direct light thrown by one candle on a square foot surface, every part of which is one foot away from the candle.
3. Illuminance uniformity ratio is the average illuminance of the roadway design area between two adjacent divided by the lowest value at any point in the area.

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